The parameters are:
        w       data width
        aw      alpha width
        arch    architecture select 0,1,2,3,4
        del     delay goal in ps
        pipe    pipeline mode on,off
        mult    multiplier type auto,nonbooth,booth
        fa      final adder architecture fastcla,csa,cla,clsa
        subtype subtractor architecture (arch=0,2 only)
        intrnd  internal rounding point (area-vs-accuracy)

First, just play with the default values for all parameters
execpt arch.  Build the default circuit for arch=0,1,2,3,4.
Those five will be a good start.

Next, you can use the parameter iteration file included (alphablend.iter).
This filename is specified in the GUI in the "Par Iter File:" field.
This will build 50 permutations of the alpha blender.  Remember to delete
the parameter iteration file name from the GUI when you want to control
the parameters from the "Parameters:" field.

Automatic pipelining can be used.  From the "Synthesis" pull down
menu, select "Pipeline".  In the "Optimization" field enter the
delay goal in ps.
